212103100123 has 4 divisors (see below), whose sum is σ = 212106774528. Its totient is φ = 212099425720.

The previous prime is 212103100081. The next prime is 212103100207. The reversal of 212103100123 is 321001301212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212103100123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212103100097 and 212103100106.

It is not an unprimeable number, because it can be changed into a prime (212103106123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1749211 + ... + 1866532.

It is an arithmetic number, because the mean of its divisors is an integer number (53026693632).

Almost surely, 2^212103100123 is an apocalyptic number.

212103100123 is a deficient number, since it is larger than the sum of its proper divisors (3674405).

212103100123 is an equidigital number, since it uses as much as digits as its factorization.

212103100123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3674404.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 212103100123 its reverse (321001301212), we get a palindrome (533104401335).

The spelling of 212103100123 in words is "two hundred twelve billion, one hundred three million, one hundred thousand, one hundred twenty-three".